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28 July 2014 Fluoride damage to substrates during stripping of mirrors
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Abstract
Fluorides are useful low-index materials that can be used to enhance reflectivity of over-coated metallic films. In particular, YF3 has been suggested as a useful low-stress low-index material in the IR where film layers must be thicker, and it has also been found to enhance durability in silver-based mirrors. However, if these mirrors need to be stripped for recoating, care must be taken with the stripping process to avoid damaging a silica-based substrate through production of hydrofluoric acid. We present data that such damage can occur, and discuss empirically-derived alternative stripping processes in place of the normal acid-based approach to mitigate the danger.
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Andrew C. Phillips, Brian DuPraw, David Hilyard, Donald Gavel, Daren Dillon, and Renate Kupke "Fluoride damage to substrates during stripping of mirrors", Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91515I (28 July 2014); https://doi.org/10.1117/12.2056887
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